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Nitrogen-oxygen co-doped carbon-coated metal lithium anode active material, anode, lithium metal battery and preparation and application thereof

An anode active, metal lithium technology, applied in the field of active materials of lithium metal batteries, can solve problems such as poor cycleability, low Coulomb efficiency, dendrites, etc., to reduce volume expansion, alleviate volume effect, and solve the effect of dendrites

Active Publication Date: 2020-10-09
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the current problems of dendrites, low coulombic efficiency, and poor cycle performance in metal lithium anodes, the first purpose of the present invention is to provide a nitrogen-oxygen co-doped carbon-coated metal lithium anode active material, aiming at improving the stability of lithium anodes performance, improve its electrical performance

Method used

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  • Nitrogen-oxygen co-doped carbon-coated metal lithium anode active material, anode, lithium metal battery and preparation and application thereof
  • Nitrogen-oxygen co-doped carbon-coated metal lithium anode active material, anode, lithium metal battery and preparation and application thereof
  • Nitrogen-oxygen co-doped carbon-coated metal lithium anode active material, anode, lithium metal battery and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Carbon hollow spheres (specific surface area 100m 2 / g, the carbon wall thickness is 5nm, and the internal cavity volume accounts for 90% of the total volume), dispersed in the mixture of concentrated sulfuric acid and concentrated nitric acid (volume ratio 3:1), ultrasonicated for 30min, stirred for 400min, then centrifuged and dried ,; then place it in ammonia gas and argon gas (gas volume ratio: 2:8) at 500°C for heat treatment for 60 minutes to obtain a doped carbon hollow sphere material (oxygen content 5.5 at.%, oxygen content 3.2 at. %). Then it is mixed with polyvinylidene fluoride at a mass ratio of 9:1, and then coated on a copper foil (10 μm in thickness) with a coating thickness of 20 μm. The electrode is used as the working electrode, the metal lithium sheet is used as the counter electrode, and 1M LiTFSI / DOL:DME (volume ratio 1:1) contains 1wt.% LiNO 3 Coin cell assembly for electrolyte at 3mA / cm 2 Under the current density, the charge-discharge cycle t...

Embodiment 2

[0059] Full battery case:

[0060] Carbon hollow spheres (specific surface area 100m 2 / g, the carbon wall thickness is 5nm, and the internal cavity volume accounts for 90% of the total volume), dispersed in the mixture of concentrated sulfuric acid and concentrated nitric acid (volume ratio 3:1), ultrasonicated for 30min, stirred for 400min, then centrifuged and dried , to obtain a doped hollow spherical carbon material (oxygen content 2.3at.%). Then it is mixed with polyvinylidene fluoride at a mass ratio of 9:1, and then coated on a copper foil (10 μm in thickness) with a coating thickness of 20 μm. Then deposit 50mAh / cm into the hollow carbon sphere chamber by electrochemical deposition 2 Lithium metal, the electrode is used as the negative electrode, the sulfur positive electrode (sulfur load 52%) is used as the positive electrode, and 1MLiTFSI / DOL:DME (volume ratio 1:1) contains 1wt.% LiNO 3 Full cell assembly for electrolyte (E / S=20) at 3mA / cm 2 Under the current de...

Embodiment 3

[0062] Carbon hollow spheres (specific surface area 146m 2 / g, the carbon wall thickness is 12nm, and the internal cavity volume accounts for 92% of the total volume), dispersed in a mixture of concentrated sulfuric acid and concentrated nitric acid (volume ratio 3:1), ultrasonicated for 30min, stirred for 300min, then centrifuged and dried , to obtain a doped hollow spherical carbon material (oxygen content 1.98at.%). Then it is mixed with polyvinylidene fluoride at a mass ratio of 9:1, and then coated on copper foil (10 μm in thickness) with a coating thickness of 50 μm. Then deposit 50mAh / cm into the hollow carbon sphere chamber by electrochemical deposition 2 Lithium metal, the electrode is used as the negative electrode, the ternary material (811) is used as the positive electrode, and 1.0MLiPF 6 in EC:DMC:DEC=1:1:1Vol%with 1.0%VC as the electrolyte (E / S=5) for full battery assembly, at 1C current, conduct charge-discharge cycle test. The test results are shown in Tabl...

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Abstract

The invention belongs to the field of lithium metal batteries, and particularly discloses a nitrogen-oxygen co-doped carbon-coated metal lithium anode active material, and the material is characterized in that the material contains a carbon hollow sphere and a metal lithium elementary substance filled in an inner cavity of the carbon hollow sphere; the ball wall material of the carbon hollow ballis nitrogen-oxygen co-doped graphitized carbon, and the ball wall has a mesoporous structure. The invention also discloses a lithium metal anode and a lithium metal battery containing the nitrogen-oxygen co-doped carbon-coated metal lithium anode active material. The nitrogen-oxygen co-doped carbon hollow sphere can effectively reduce the overpotential in the lithium metal nucleation and deposition process, provides uniform nucleation and deposition sites, enables lithium metal to stably and uniformly grow in a current collector, and realizes uniform deposition and dissolution of a lithium metal anode in a long cycle process. In addition, the stable and ordered carbon skeleton can greatly reduce the volume expansion in the cycle process, greatly prolong the cycle life of the lithium metalbattery and greatly improve the safety performance of the lithium metal battery.

Description

technical field [0001] The invention belongs to the technical field of lithium metal batteries, and specifically discloses an active material for lithium metal batteries. Background technique [0002] At present, lithium-ion batteries have been widely used in advanced portable electronic products, electric vehicles, and energy storage power stations. With the increasing requirements for battery energy density, the development of high specific energy secondary batteries has become a research hotspot in recent years. Lithium metal anode with up to 3860mA / cm 2 The theoretical specific capacity and the electrode potential of -3.045V (relative to the standard hydrogen electrode) are known as the "Holy Grail" lithium anode material. However, the lithium anode has problems such as dendrites and high volume effects during repeated cycles. It leads to low Coulombic efficiency and poor cycle performance; and the growth of lithium dendrites may pierce the separator and cause a short c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/13H01M10/0525
CPCH01M4/13H01M4/362H01M4/382H01M4/625H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 赖延清洪波高春晖向前范海林
Owner CENT SOUTH UNIV
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